Development of aerosol activation in the double-moment Unified Model and evaluation with CLARIFY measurements

Gordon, Hamish; Field, Paul R.; Abel, Steven J.; Barrett, Paul; Bower, Keith; Crawford, Ian; Cui, Zhiqiang; Grosvenor, Daniel P.; Hill, Adrian A.; Taylor, Jonathan; Wilkinson, Jonathan; Wu, Huihui; Carslaw, Ken S.

doi:10.5194/acp-20-10997-2020

Articles | Volume 20, issue 18

https://doi.org/10.5194/acp-20-10997-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

New observations and related modelling studies of the aerosol–cloud–climate...

https://doi.org/10.5194/acp-20-10997-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 18

Research article

|

25 Sep 2020

Research article |

| 25 Sep 2020

Development of aerosol activation in the double-moment Unified Model and evaluation with CLARIFY measurements

Hamish Gordon, Paul R. Field, Steven J. Abel, Paul Barrett, Keith Bower, Ian Crawford, Zhiqiang Cui, Daniel P. Grosvenor, Adrian A. Hill, Jonathan Taylor, Jonathan Wilkinson, Huihui Wu, and Ken S. Carslaw

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Feb 2020	111	22	1	134
Mar 2020	62	17	2	81
Apr 2020	20	8	0	28
May 2020	14	8	1	23
Jun 2020	24	9	0	33
Jul 2020	31	18	7	56
Aug 2020	17	10	2	29
Sep 2020	209	60	1	270
Oct 2020	60	28	3	91
Nov 2020	24	19	0	43
Dec 2020	27	21	0	48
Jan 2021	43	19	0	62
Feb 2021	21	11	0	32
Mar 2021	28	13	0	41
Apr 2021	27	9	0	36
May 2021	26	6	1	33
Jun 2021	19	19	0	38
Jul 2021	23	27	0	50
Aug 2021	34	9	0	43
Sep 2021	31	8	0	39
Oct 2021	34	56	0	90
Nov 2021	54	40	1	95
Dec 2021	34	16	1	51
Jan 2022	16	11	0	27
Feb 2022	28	12	3	43
Mar 2022	28	24	0	52
Apr 2022	21	13	1	35
May 2022	14	20	0	34
Jun 2022	24	9	2	35
Jul 2022	35	8	0	43
Aug 2022	100	19	0	119
Sep 2022	20	14	0	34
Oct 2022	66	9	3	78
Nov 2022	24	15	0	39
Dec 2022	17	5	0	22
Jan 2023	22	23	0	45
Feb 2023	28	18	1	47
Mar 2023	40	22	5	67
Apr 2023	31	43	1	75
May 2023	20	11	0	31
Jun 2023	22	8	2	32
Jul 2023	38	15	3	56
Aug 2023	20	11	5	36
Sep 2023	19	14	0	33
Oct 2023	29	17	1	47
Nov 2023	16	14	0	30
Dec 2023	232	9	4	245
Jan 2024	21	10	0	31
Feb 2024	16	15	2	33
Mar 2024	25	30	1	56
Apr 2024	40	17	2	59
May 2024	27	19	8	54
Jun 2024	58	18	18	94
Jul 2024	541	13	2	556
Aug 2024	33	9	3	45
Sep 2024	24	10	0	34
Oct 2024	32	6	0	38
Nov 2024	22	5	1	28
Dec 2024	33	11	0	44
Jan 2025	32	10	1	43
Feb 2025	31	10	3	44
Mar 2025	23	14	0	37
Apr 2025	36	10	0	46
May 2025	49	10	1	60
Jun 2025	75	9	5	89
Jul 2025	53	19	1	73
Aug 2025	107	18	0	125
Sep 2025	293	20	1	314
Oct 2025	46	18	2	66
Nov 2025	144	21	3	168
Dec 2025	24	6	0	30

Cumulative views and downloads (calculated since 21 Feb 2020)

Month	HTML	PDF	XML	Total
Feb 2020	111	22	1	134
Mar 2020	62	17	2	81
Apr 2020	20	8	0	28
May 2020	14	8	1	23
Jun 2020	24	9	0	33
Jul 2020	31	18	7	56
Aug 2020	17	10	2	29
Sep 2020	209	60	1	270
Oct 2020	60	28	3	91
Nov 2020	24	19	0	43
Dec 2020	27	21	0	48
Jan 2021	43	19	0	62
Feb 2021	21	11	0	32
Mar 2021	28	13	0	41
Apr 2021	27	9	0	36
May 2021	26	6	1	33
Jun 2021	19	19	0	38
Jul 2021	23	27	0	50
Aug 2021	34	9	0	43
Sep 2021	31	8	0	39
Oct 2021	34	56	0	90
Nov 2021	54	40	1	95
Dec 2021	34	16	1	51
Jan 2022	16	11	0	27
Feb 2022	28	12	3	43
Mar 2022	28	24	0	52
Apr 2022	21	13	1	35
May 2022	14	20	0	34
Jun 2022	24	9	2	35
Jul 2022	35	8	0	43
Aug 2022	100	19	0	119
Sep 2022	20	14	0	34
Oct 2022	66	9	3	78
Nov 2022	24	15	0	39
Dec 2022	17	5	0	22
Jan 2023	22	23	0	45
Feb 2023	28	18	1	47
Mar 2023	40	22	5	67
Apr 2023	31	43	1	75
May 2023	20	11	0	31
Jun 2023	22	8	2	32
Jul 2023	38	15	3	56
Aug 2023	20	11	5	36
Sep 2023	19	14	0	33
Oct 2023	29	17	1	47
Nov 2023	16	14	0	30
Dec 2023	232	9	4	245
Jan 2024	21	10	0	31
Feb 2024	16	15	2	33
Mar 2024	25	30	1	56
Apr 2024	40	17	2	59
May 2024	27	19	8	54
Jun 2024	58	18	18	94
Jul 2024	541	13	2	556
Aug 2024	33	9	3	45
Sep 2024	24	10	0	34
Oct 2024	32	6	0	38
Nov 2024	22	5	1	28
Dec 2024	33	11	0	44
Jan 2025	32	10	1	43
Feb 2025	31	10	3	44
Mar 2025	23	14	0	37
Apr 2025	36	10	0	46
May 2025	49	10	1	60
Jun 2025	75	9	5	89
Jul 2025	53	19	1	73
Aug 2025	107	18	0	125
Sep 2025	293	20	1	314
Oct 2025	46	18	2	66
Nov 2025	144	21	3	168
Dec 2025	24	6	0	30

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Short summary

The Met Office's Unified Model is widely used both for weather forecasting and climate prediction. We present the first version of the model in which both aerosol and cloud particle mass and number concentrations are allowed to evolve separately and independently, which is important for studying how aerosols affect weather and climate. We test the model against aircraft observations near Ascension Island in the Atlantic, focusing on how aerosols can "activate" to become cloud droplets.


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